1.5 Etiology

Question 1

malocclusion due to both ___ and the ___ ___

Answer 1

genetics
functional matrix

Question 2

class 1 malocclusion prevalence (caucasians)

Answer 2

70%

Question 3

___ of class 2 are bimax retrusion

Answer 3

40%

Question 4

class 2 is mostly ___ ___

Answer 4

Mn retrognathism

Question 5

typical class 2 (3)

Answer 5

Mn retrognathism
incisor proclination
deep bite

Question 6

___ and ___ dimensions are variable in class 1 malocclusion

Answer 6

vertical
transverse
(AP WNL)

Question 7

how is transverse dimension measured

Answer 7

IM distance
IC distance

Question 8

SNA =

Answer 8

Mx

Question 9

SNB =

Answer 9

Mn

Question 10

most class 3 are due to ___ ___

Answer 10

Mx retrognathism

Question 11

class 3 most common with ___

Answer 11

asians

Question 12

open bite etiologies (4)

Answer 12

transitory
skeletal (genetic)
neuromuscular
combination sleep apnea

Question 13

WNL overbite

Answer 13

15-20%

Question 14

deep bite due to either ___ ___ or ___ ___

Answer 14

incisor overeruption
molar undereruption

Question 15

Dr R oligodontia definition

Answer 15

missing > 4

Question 16

congenitally missing teeth mostly due to ___

Answer 16

genetics

Question 17

most common missing teeth (3)

Answer 17

Mx LI
Mn 2nd PM
Mn CI

Question 18

overall bolton ratio

Answer 18

91%

Question 19

anterior bolton ratio

Answer 19

77%
(lower is about 3/4 upper)

Question 20

normal bolton ratio is needed to do what?

Answer 20

develop proper overbite and overjet

Question 21

impacted Mx CIs due to what?

Answer 21

trauma (roots become dilacerated)

Question 22

most impacted tooth overall

Answer 22

Mx cuspids (3-4%)

Question 23

malocclusions are due to both ___ and ___ origins

Answer 23

skeletal
DA

Question 24

ortho Tx approach is defined by what?

Answer 24

malocclusion etiology